Pasteurizer



July 15, 1941. N. J. PETERS .PASTEURIZER Filed March 13, 1939 3 Sheets-Sheet 1 FIG. I.

lNVENTOR t MK.

ATTORNEYS July 15', 1941.- N, J, PETERS 2,249,036

PASTEURIZER l Filed March 13, 1939 3 sheets-shea; 2

FIG. 3.

INVENTOR ATTORNEYS BY* Quan/Zu# N. J. PETERS PASTEURIZER July 15, 1941.

Filed March 13, 1939 5 Sheets-Sheet 3 faNvENTR BY I ATTORN'EYS Patented July 1,5-, 1941 i'JNlTFE STAT ES PATEN T FFICE 2,249,036n i' i PASTEURIZER Norman J. Peters, Fonddu-LaarWism assignor to Y Damrow Brothers CompanyfFond du Lac,` Wis., a corporation of 'WisconsinVv l Applicationlviarch 13, 1939,-Serial-No: 261,516

3 Cisims.

The invention 'relates to pasteurizing appa.- ratus and more particularly to a pasteurizer for milk.

The general'object vof a pasteurizer is to heat milk `from the temperature` at whichY itV is cooled, usually about 49 Fahrenheit to Aabout. 143 Fahrenheit for pasteurizing, holdingfor thirty minutes and then pumping it out of the pasteurizer, cooling and 'bottling for distribution as market milk. Usually the heating is ldone in a steam or water jacketed tank, but according to the present invention the milk is broughtup to a pasteurizing temperature very quickly with a low temperature heating medium yso Ias not to al''ect the'flavor, and the' agitation'is such as to pass the milk over the heating surface as 'quickly as possible Without aiecting the cream line, and 'without whipping' the milk. vAccording 'to the present invention the heated water is sprayed ordistributed'against the sides and bottom of the milk container to eie'ct the heatinggof its contents, and since only a small volume of Water is circulated through the heating system, the temperature of this water will be raised to a practical heating temperature quickly, thus heating the milk as quickly as possible. The kheated Water is delivered both against the sides andthe bottm,'and when the circulation of this water stops, the direct heating stops, so that substantially no heat is added to the milk While it is being held 'at' a pasteurizingv temperature', and hence overheating and consequent caramelization of the milk is prevented. The distributing system which is used for heatingv the milk can l also be used for coolingwith cold water or water slightly above freezing, and with a good difference in temperature the system will a-lso act to efficiently cool the milk. While the apparatus embodying the invention has been primarilydesigned for milk, it may also be used for treating or making chocolate mix, buttermilk, cream, ice cream mix, and similar products. As hereinafter described, it will be noted that the apparatus is so constructed that its parts may be kept in sanitary condition.

The invention further consists in the several features hereinafter set forth and more particu.- larly dened by claims at the conclusion hereof.

In the drawings:

Fig. 1 is a plan View of an apparatus embodying the invention, par-ts being broken away and parts being shown in section;

Fig. 2 is a detailed sectional view taken on the line 2-2 oi Fig. 1;

Fig.'4 3 is-"an vertical sectional -view takenf generally Valong the -line i3--3 of'l l'i'g.'v l;

Fig-.4is'a detailed sectional' View vtaken on the line 4-6 "of Fig-1;

Fig, 5-is-a sideelevation View takenr` on thev line 5-5loi 3.

Referring to the drawings, the apparatus comy cylindrical container having 'an outerv Wall I8.

and aninner'wall- II, the space between the wallsebeingi'llled with suitable insulating material I2, said container being supportedon. adjustable legs I3 v'and having a centrally disposed water inlet opening I4. in its bottom and adrain outlet I5 extending a short distance above'its bottom so-that a small body of heating or coolingr fluidfmay be maintained in the'bottom portion of said container;

The inner container 8 is' of cylindrical form with rounded cornersIG 'between the sides and bottom for ready cleaning, and saidl sides have an annular ange Ill secured thereto which rests on a rubber gasketv I8'- on the top of the outer` container 9 and is detachably Ysecured thereto by screws I9.vv The'container 8 is provided with: av4 cover formed of a rela-tively fixed semi-circular section 28 and a section 2I hingedly secured thereto along a ydiagonally extending hinge 22. i Y

A. shelf `23Y i-s secured to the container 9 by screws 24 and has a miotor 25 (mounted thereon connected by la belt drive 26 with `a reduction Y out by a :distributor plate-32 spaced a short distance from the bottom. Thefbottomof :the containerx and alsomthe'plateSZ is-preferably conically inclined Afor strengthjso that-a relatively light gauge metal may be used though these parts may be flat if desired. Hot Water is also delivered through spaced upright pipes 33 to an upper ring 34 which is provided with spray openings 35 which direct small streams of heated or cooled water against the sides of the container 8 which, after striking said sides, iiow down the same and drain into the bottom of the container 9. The outer edge 36 of the plate 32 is preferably downwardly curved to facilitate the drainage of water therefrom.

The container 8 has a drainage opening 31 adjacent lthe bottom provided with an outlet nange 38 which detachably connects with an outlet t-ting 39 detachably secured Ito the outer container 9.

It -is to be noted that removal of the screws I9 and Athe tting 39 permits the inner container 8 being lifted out of Ithe outer container 9. 'Ihe distributor plate 32 is detachably mounted on the pipe 3l and may be secured to or be separate from the-bottom of the inner container 8.

The pipes 3l and 33 communicate with a pipe 48 which connects by pipes 4I and 44 with the dis-charge of a centrifugal pump 45, the pipe section 44 having a shutoi value 46 therein.

The bottom of the tank 9 is provided with a drain opening 41 (see Figs. 1 and 2) which connects with a drain passage 48 that is provided w-ith a 4strainer 49 and connects by a pipe 58 with the inlet to the pump 45. A supply of fresh water inlet 5I connects with the passage 48 and is controlled by a suitable shutoi valve.

With the above arrangement the water from the bottom of the tank 9 is circulated from the heating or cooling system by the operation of the pump 45, the water being taken in through the passage 48 and being discharged through pipes 4|, 44, 49, 3l, and 33 to the interiorof the tank 9, the pipes 3| and 34 provided with outlets for directing water against the container 8. The pipe l5 is an overflow pipe to prevent the water rising too high above the bottom of the tank and thus acts to maintain the level of the water in the bottom of the tank at a substantially constant height.

For heating the circulating water, means are 1 provided for introducing live steam into the discharge line comprising a steam nozzle 53 which discharges into the pipe 40 and connects with steam pipe 54 provided with a -suitably controlled valve 55 that is regulated by a thermostat 56 in the pipe 4B operatively connected with said valve.

The pipe 44 has a well for a thermometer?! and also an air outlet ycontrolled by a valve 58, which is also associated with a pressure gauge 59.

The passage 48 has a drain outlet controlled by a shutoff valve 68. Y

With the above arrangement while the pump 45 and agitator 29 are running, the heating or cooling iiuid is sprayed or iilmed out against the sides and bottom of the inner container 8 containing the material to be treated Ito heat or cool the same, it being noted that in case of heating the introduction of steam `into the circulating water causes the spray to expeditiously heat the substance such as milk in the container 8 to la pasteuriZin-g temperature, as for example 143Fahrenheit,andthenby shutting oi the pump or stopping the circulation the milk may be readily held at that temperature for thirty minutes, the heated water'in the bottom of the tank 9 assisting in maintaining this temperature, it being noted that the agitator acts to bring different portions of milk or other matei rial being treated in contact with the heated sides of the container 8. Thus while Ithe contents of the container 8 may be readily brought .to the desired temperature, the danger of overheating them is prevented, and thus the quality of the milk is not effected from overheating.

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far yas such limitations are included in the claims.

What I claim as my invention is:

1. In a -device of the character described, the combinati-on cf an outer container, an inner container disposed within said outer container and in spaced relation thereto at the sides and bottom thereof and having siding and a bottom eX- tending at lan abrupt angle to said siding, a spreader plate adjacent the bottom of said inner container throughout substantially its entire area, :means for circulating a thermal changing liquid through the outer container to change the temperature of .the contents of the inner container including means for spraying streams of said liquid downwardly along the sides of said inner container and for directing a stream oi' said liquid between the bottom of said inner container and said plate, Athe bottom of said inner container being spaced from that of said outer container to provide a liquid storage space below said inner container.

2. In la device of the character described, the combination of an outer container, an inner container disposed within said outer container and in spaced relation thereto at the sides and bottom thereof and having siding and a bott-om extending at an abrupt angle to said siding, a spreader plate adjacent the bottom oi said inner container throughout substantially its entire area, means for circulating a thermal changing liquid through the outer -container to change the temperature of lthe contents of the inner container including a circular pipe adjacent the upper portion of the inner chamber provided with spray openings for directing water against the sides of the inner chamber and with means for directing a thin stream of said liquid between the bottom of -said inner container and said plate, the bottom -of said inner container being spaced from that of lsaid outer container to provide a liquid storage space below said inner container.

3. In a devi-ce of the character described, the combination of an -outercontainen an inner contain-er extending into said -outer container in spaced relation with the sides and bottom and detachably connected `at its upper end with lthe upper portion of said outer container, a plate secured in close spaced relation to the bottom of said inner container and provided with a centr-al opening, a pipe detachably mounted in said -opening for conducting a thermal changing liquid into the space between the bottom of said inner container and said plate, a circular pipe adjacent the upper portion of the inner chamber provided with spray openings for directing water against the sides of the inner chamber, yand means for circulating the thermal changing liquid through said first named pipe and said circular pipe, the bottom off said inner container being spaced from that of said outer container to provide a liquid storage space below said inner container.

NORMAN J. PETERS. 

